Over the next several days , he drank his own urine to stay hydrated and experimented with the idea of amputating his arm with a pocketknife , but he had no way of sawing through two bones in his arm .

此后几天，他只好喝自己的尿，以免脱水，同时也在脑子里反复盘算一个念头：用刀子切断胳膊！可是没有锯子，他想不出用什么办法才能弄断手臂里面的那两根骨头。